We can debate if you like. Nobody said anything about "running out of glucose". I stated an inability to "use" glucose. This is what the research suggests. You can choose to ignore this research, but the research exists. Here's a citation on brain wide glucose utilization deficits: [https://pubmed.ncbi.nlm.nih.gov/7766852/](https://pubmed.ncbi.nlm.nih.gov/7766852/) Here's a study on reductions in cerebral blood flow to brocas area at rest: [https://pubmed.ncbi.nlm.nih.gov/28035724/](https://pubmed.ncbi.nlm.nih.gov/28035724/) Here's a study that found reduction in blood flow response to a speech production task in the left IFG/brocas area [https://pubmed.ncbi.nlm.nih.gov/28642548/](https://pubmed.ncbi.nlm.nih.gov/28642548/) In addition, you cannot provide a citation that stutterers are often fluent when truly alone "because there's no sense of being judged." This is reductionism at its finest. It's about time we move away from these attempts at psychological explanations of stuttering. It's outdated speculation.